High Level Summary of Statistics Trend Last update: September 17, 2019
Ground Level Ozone Concentration
Ozone in the stratosphere forms a layer that protects the earth against harmful ultra-violet radiation, but tropospheric (ground level) ozone is a damaging oxidant. Exposure to high ozone concentrations can cause respiratory damage, and affects vegetation by damaging leaves and reducing yields.
Ozone is formed by a slow, complicated series of reactions from other pollutants that may be blown over from Europe. The most important man-made precursors are nitrogen oxides and volatile organic compounds produced by road transport, industrial processes and solvent use. Ozone concentrations tend to be lower in urban areas where it is converted to nitrogen dioxide by reacting with nitrogen oxides.
The Air Quality Strategy 1 objective for ground level ozone (to be met by 2005) states that the maximum daily concentration (measured as an 8-hour running mean) of 100µg/m3 should not be exceeded more than 10 times per year. In 2018, this objective was met for 2 out of 11 sites, compared to 10 out of 11 sites in 2017.
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Source: Scotland Air Quality Data and Statistics Database
Note (1): Department for Environment, Food and Rural Affairs, Scottish Executive, Welsh Assembly Government and DOE Northern Ireland. The Air Quality Strategy for England, Scotland, Wales and Northern Ireland.